1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_SB_MEMBERS_H
3 #define _BCACHEFS_SB_MEMBERS_H
5 int bch2_members_v2_init(struct bch_fs *c);
6 int bch_members_cpy_v2_v1(struct bch_sb_handle *disk_sb);
7 struct bch_member *bch2_members_v2_get_mut(struct bch_sb *sb, int i);
8 struct bch_member bch2_sb_member_get(struct bch_sb *sb, int i);
10 static inline bool bch2_dev_is_online(struct bch_dev *ca)
12 return !percpu_ref_is_zero(&ca->io_ref);
15 static inline bool bch2_dev_is_readable(struct bch_dev *ca)
17 return bch2_dev_is_online(ca) &&
18 ca->mi.state != BCH_MEMBER_STATE_failed;
21 static inline bool bch2_dev_get_ioref(struct bch_dev *ca, int rw)
23 if (!percpu_ref_tryget(&ca->io_ref))
26 if (ca->mi.state == BCH_MEMBER_STATE_rw ||
27 (ca->mi.state == BCH_MEMBER_STATE_ro && rw == READ))
30 percpu_ref_put(&ca->io_ref);
34 static inline unsigned dev_mask_nr(const struct bch_devs_mask *devs)
36 return bitmap_weight(devs->d, BCH_SB_MEMBERS_MAX);
39 static inline bool bch2_dev_list_has_dev(struct bch_devs_list devs,
44 for (i = 0; i < devs.nr; i++)
45 if (devs.devs[i] == dev)
51 static inline void bch2_dev_list_drop_dev(struct bch_devs_list *devs,
56 for (i = 0; i < devs->nr; i++)
57 if (devs->devs[i] == dev) {
58 array_remove_item(devs->devs, devs->nr, i);
63 static inline void bch2_dev_list_add_dev(struct bch_devs_list *devs,
66 if (!bch2_dev_list_has_dev(*devs, dev)) {
67 BUG_ON(devs->nr >= ARRAY_SIZE(devs->devs));
68 devs->devs[devs->nr++] = dev;
72 static inline struct bch_devs_list bch2_dev_list_single(unsigned dev)
74 return (struct bch_devs_list) { .nr = 1, .devs[0] = dev };
77 static inline struct bch_dev *__bch2_next_dev(struct bch_fs *c, unsigned *iter,
78 const struct bch_devs_mask *mask)
80 struct bch_dev *ca = NULL;
83 ? find_next_bit(mask->d, c->sb.nr_devices, *iter)
84 : *iter) < c->sb.nr_devices &&
85 !(ca = rcu_dereference_check(c->devs[*iter],
86 lockdep_is_held(&c->state_lock))))
92 #define for_each_member_device_rcu(ca, c, iter, mask) \
93 for ((iter) = 0; ((ca) = __bch2_next_dev((c), &(iter), mask)); (iter)++)
95 static inline struct bch_dev *bch2_get_next_dev(struct bch_fs *c, unsigned *iter)
100 if ((ca = __bch2_next_dev(c, iter, NULL)))
101 percpu_ref_get(&ca->ref);
108 * If you break early, you must drop your ref on the current device
110 #define for_each_member_device(ca, c, iter) \
112 (ca = bch2_get_next_dev(c, &(iter))); \
113 percpu_ref_put(&ca->ref), (iter)++)
115 static inline struct bch_dev *bch2_get_next_online_dev(struct bch_fs *c,
122 while ((ca = __bch2_next_dev(c, iter, NULL)) &&
123 (!((1 << ca->mi.state) & state_mask) ||
124 !percpu_ref_tryget(&ca->io_ref)))
131 #define __for_each_online_member(ca, c, iter, state_mask) \
133 (ca = bch2_get_next_online_dev(c, &(iter), state_mask)); \
134 percpu_ref_put(&ca->io_ref), (iter)++)
136 #define for_each_online_member(ca, c, iter) \
137 __for_each_online_member(ca, c, iter, ~0)
139 #define for_each_rw_member(ca, c, iter) \
140 __for_each_online_member(ca, c, iter, 1 << BCH_MEMBER_STATE_rw)
142 #define for_each_readable_member(ca, c, iter) \
143 __for_each_online_member(ca, c, iter, \
144 (1 << BCH_MEMBER_STATE_rw)|(1 << BCH_MEMBER_STATE_ro))
147 * If a key exists that references a device, the device won't be going away and
148 * we can omit rcu_read_lock():
150 static inline struct bch_dev *bch_dev_bkey_exists(const struct bch_fs *c, unsigned idx)
152 EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
154 return rcu_dereference_check(c->devs[idx], 1);
157 static inline struct bch_dev *bch_dev_locked(struct bch_fs *c, unsigned idx)
159 EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
161 return rcu_dereference_protected(c->devs[idx],
162 lockdep_is_held(&c->sb_lock) ||
163 lockdep_is_held(&c->state_lock));
166 /* XXX kill, move to struct bch_fs */
167 static inline struct bch_devs_mask bch2_online_devs(struct bch_fs *c)
169 struct bch_devs_mask devs;
173 memset(&devs, 0, sizeof(devs));
174 for_each_online_member(ca, c, i)
175 __set_bit(ca->dev_idx, devs.d);
179 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v1;
180 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v2;
182 #endif /* _BCACHEFS_SB_MEMBERS_H */